晋太元中,武陵人捕鱼为业。缘溪行,忘路之远近。忽逢桃花林,夹岸数百步,中无杂树,芳草鲜美,落英缤纷。渔人甚异之,复前行,欲穷其林。 林尽水源,便得一山,山有小口,仿佛若有光。便舍船,从口入。初极狭,才通人。复行数十步,豁然开朗。土地平旷,屋舍俨然,有良田、美池、桑竹之属。阡陌交通,鸡犬相闻。其中往来种作,男女衣着,悉如外人。黄发垂髫,并怡然自乐。 见渔人,乃大惊,问所从来。具答之。便要还家,设酒杀鸡作食。村中闻有此人,咸来问讯。自云先世避秦时乱,率妻子邑人来此绝境,不复出焉,遂与外人间隔。问今是何世,乃不知有汉,无论魏晋。此人一一为具言所闻,皆叹惋。余人各复延至其家,皆出酒食。停数日,辞去。此中人语云:“不足为外人道也。”(间隔 一作:隔绝) 既出,得其船,便扶向路,处处志之。及郡下,诣太守,说如此。太守即遣人随其往,寻向所志,遂迷,不复得路。 南阳刘子骥,高尚士也,闻之,欣然规往。未果,寻病终。后遂无问津者。
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isl is a thread-safe C library for manipulating sets and relations
of integer points bounded by affine constraints. The descriptions of
the sets and relations may involve both parameters and existentially
quantified variables. All computations are performed in exact integer
arithmetic using GMP.
isl is released under the MIT license, but depends on the LGPL GMP
library.
Minimal compilation instructions:
./configure
make
make install
If you are taking the source from the git repository, then you first
need to do
git clone git://repo.or.cz/isl.git
./autogen.sh
For more information, see doc/user.pod or the generated documentation.
New releases are announced on http://freecode.com/projects/isl
If you use isl, you can let me know by stacking
https://www.ohloh.net/p/isl on ohloh.
For bug reports, feature requests and questions,
contact http://groups.google.com/group/isl-development
Whenever you report a bug, please mention the exact version of isl
that you are using (output of "./isl_cat --version"). If you are unable
to compile isl, then report the git version (output of "git describe")
or the version included in the name of the tarball.
If you use isl for your research, you are invited do cite
the following paper and/or the paper(s) describing the specific
operations you use.
@incollection{Verdoolaege2010isl,
author = {Verdoolaege, Sven},
title = {isl: An Integer Set Library for the Polyhedral Model},
booktitle = {Mathematical Software - ICMS 2010},
series = {Lecture Notes in Computer Science},
editor = {Fukuda, Komei and Hoeven, Joris and Joswig, Michael and
Takayama, Nobuki},
publisher = {Springer},
isbn = {978-3-642-15581-9},
pages = {299-302},
volume = {6327},
year = {2010}
}